Update default power levels for room and encrypt rooms on creation

src/utils/matrix.ts

@@ -251,7 +251,8 @@ export async function createRoom(
         "m.room.encryption": 100,
         "m.room.name": 50,
         "m.room.message": 0,
-        "m.room.encrypted": 50,
+        // revert this once we do not rely on room messages for perSenderKeys anymore
+        "m.room.encrypted": 0,
         "m.sticker": 50,
         "org.matrix.msc3401.call.member": 0,
       },
@@ -259,6 +260,15 @@ export async function createRoom(
         [client.getUserId()!]: 100,
       },
     },
+    initial_state: [
+      {
+        type: "m.room.encryption",
+        state_key: "",
+        content: {
+          algorithm: "m.megolm.v1.aes-sha2",
+        },
+      },
+    ],
   });
 
   // Wait for the room to arrive